INFRATHERM
pyrometers IS 5 · IS 5-LO · IGA 5 · IGA 5-LO
42
7.1.1
Types IS 5 and IGA 5
Temperature range
Temperature range
IS 5
IGA 5
IS 5
IGA 5
O
O
p
p
t
t
i
i
c
c
s
s
N
N
(for short
distance
90 ... 250 mm)
MB 20
MB 25
MB 30
MB 20
MB 18
MB 25
MB 30
O
O
p
p
t
t
i
i
c
c
s
s
F
F
(for long
distances
220 ...
∞
)
MB 20
MB 25
MB 30
MB 20
MB 18
MB 25
MB 30
Distance
a
[mm]
Spot size
M
90
[mm]
Distance
a
[mm]
Spot size
M
90
[mm]
90 mm
1
0.5
1.1
0.7
220 mm
2
1
2
1
100 mm
1.1
0.6
1.3
0.8
300 mm
2.7
1.4
2.7
1.4
150 mm
1.8
0.9
2
1.1
500 mm
4.8
2.4
4.8
2.4
200 mm
2.6
1.4
2.6
1.4
800 mm
8
4
8
4
250 mm
3.1
1.6
3.6
1.8
1300 mm
13
6.6
13
6.6
5
(MB 25)
8
(MB 18, 25)
2000 mm
22
12
22
12
Aperture
D
5
3
(MB 30)
8
5
(MB 30)
4000 mm
50
28
50
28
Aperture
D
5
5
(MB 25)
3
(MB 30)
8
8
(MB 18, 25)
5
(MB 30)
7.1.2
Types IS 5-LO and IGA 5-LO (with fibre)
Optical head
Measuring distance
a
[mm]
Spot size
M
[mm]
Aperture
D
[mm]
120 mm
1.2
7
260 mm
2.6
7
Type
Ι
(small head)
700 mm
7.2
7
87 mm
0.45
17
200 mm
0.8
17
600 mm
2.7
15
Type
ΙΙ
(large head)
4500 mm
22
15
7.2
Differing to the focused measuring distance (all instrument types)
The
optical profiles
show that the
spot size
M varies with the distance from the pyrometer to the measuring
object.
Spot sizes
for intermediate distances, that are not shown on the optical profiles, may be calculated
using the formula below, where a = the nominal distance, aperture D see corresponding table):
Aperture-Ø D
Ø M
Ø M
1
Ø M
2
a
a
2
a
1
3,5
D
)
D
M
(
a
a
M
1
1
−
+
=
D
D)
(M
a
a
M
2
2
+
−
=
Note
:
The
InfraWin
program includes a calculator („IR-calculator“) that roughly estimates
the unknown values.
7.3
Fibre optic cable (IS 5-LO; IGA 5-LO)
The radiation, coming in through the optical head, is transported via the lens system into the mono glass
fibre with flexible stainless steel protection tube where it is transmitted along to the converter. The optical
head contains only the lens system, the electronics are located in the converter. That allows that fibre and
optical head can withstand ambient temperatures up to 250°C without cooling on optical head’s side (fibre on
converter’s side max. 120°C). The fibre has a red mark for correct connection to the pyrometer. This color
mark has to be mounted on the pyrometer’s side.
